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        Provides an implementation of a skyline algorithm.
        
        
        The skyline algorithm for routes was shown in:
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            <li>F. Graf, H.-P. Kriegel, M. Renz, M. Schubert: 
                <i>PAROS: Pareto Optimal Route Selection</i>, 
                In Proceedings of the ACM International Conference on Management of Data (SIGMOD), Indianapolis, IN: 1199–1202, 2010.</li>
            <li>M. Schubert, M. Renz, H.-P. Kriegel
                <i>Route skyline queries: a multi-preference path planning approach</i>
                In Proceedings of the 26th International Conference on Data Engineering (ICDE), Long Beach, CA: 261–272, 2010. </li>
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